wardell



H. R. WARDELL.

ROOFING CLAMP.

APPLICATION FILED SEPT 20, 'I9I5- RENEWED MM. 15. WW.

l 3% 1,95 81. mam-m NW. W, 1919.

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t l l l W HENRY 1t. WARIDlElJlZ-fOF CHICAGO, ILLINUIS, ASSIGNOR,ItlllllPihl'lEl Atlfiltfirlll'lltlldll'lfi, lltl H. W. JOHNS-MANVILLECOMPANY, it CORPORATION or Nlllllv HOME.

I ROOFING-CLHHWP.

specification. of Letters Patent.

rat-elites l 'ovmlltl, leis,

Application tiled September 20, 1916, serial No. 1213M. lEte'newed May15, 1919; lserial l lo. .rltllfltlfi.

To all whom it may concern Be it known that I, HENRY ll. lVAnonLL, acitizen of the United States of America, residing at Chicago, in thecounty of Cook and Eitate of lllinois, have invented certain new anduseful Improvements in Roofing- Clamps, of which the following 1s aspec1haction.

My invention relates'to means for tastening flexible roofing to theroofs and sides of,

buildings and consists of an improved form of metal clamp which may be,nailed to the root boards or sheathing of the building, firmly clampingthe different sheets of root ing materialtogether at their overlappingedges and tothe building. In cleats of this type, the object is toproduce as binding a ,grip on the flexible roofing fabric as possiblebothat and between the nailing points, and to accomplish this resultwith as thin a metal strip as possible, so as to reduce, as much aspossible, the costot material, the consumption of power in the pressesused to stamp out the cleats, and the wear on the dies so employed.Heretotore, various structures cessful to a degree in accomplishing thedesired result, they have required complicated forms of dies which haveworn out quite rapidly, so that after a period of use ofthe dies, thecleats stamped outlost their correctness of shape, and also the raisedarches and corrugations presented an obstruction to the flow of Waterover the root. My present invention overcomes these difficulties andalso-produces aclamp which has no sharp edges cutting into the roofing.The best form of damp at present known to me embodying my invention isillustrated in the accompanying sheet of drawings, in which- Figure l isa plan view pt the simplest form of clamp;

Fig. 2 is a-longitudinal, vertical section, taken on line 2-43 of Fig.1;

Fig. 3 is a cross-section taken on line 8-3 of Fig. 1;

Fig. t is a plan view of a modification, and

Fig. 5- is a side elevation of either torn].

the roofing tabric being shown in cross-sec-- tion, and. the upper onein edge elevation.

Throughout the drawings like referencef characters indicate like parts.1 1s a thin strlp of metal, prctcrably mild steel, which is usuallystamped out of a sheet of steel with a plurality of nailing domes 2, 2,forced up trom the body of the strip, and centrally perforated forpassage of nails at 3, These domes are centered substantially along themedial line of the clamp. in the same stamping operation, the flatportions of the strip between the nailing domesare given a curvature ordip downward, as shown at d, -Zl-, but retain their rectilinearcross-scction, as shown in Fig. 3. in Fig. 5, the clamp is shown asapplied .to roofing. it, is a portion ct root board or sheathing of abuilding, 15 is the under layer oi roofing fabric, shown in crosssection and 1G is the edge oil: the upper layer oi rooting :lahric,which has been overlapped on 15 to form a seam or oint, l he clamps areusually placed along the tops of these seams, the nails 5, passingthrough clamps and both. layers oi rooting fabric, The downward pressureat the nailing domes, resulting from nailing the clamp down, partlydeforms the curved sections 4-, t but, as the ends of these curvedsections are confined against much longitudinal movement by the nails 5,5 at either end, it said nails are drivenv straight downward, the curvedsections 4:, l, are generally compelled to retain at least a slightportion of their origi nal curvature, even at the end of the nailingoperation, as shown in Fig. 5.

In the, modilication shown in Fig. l, l employ a metal strip ll, havingcurved edges, so arranged that the strip is wider at points 12 '12,intermediate of the nailing domes than it is at the junctures with thedome portions. lit the curved wave line of each clamp side is madesymmetrical with respect to an axis parallel to the major-axis oi theclamp, such as the dotted line 13--13, a series or the clamps can bestamped out of a sheet without any waste of material,

the convex portion of the edge of one clamp' fitting into the concaveportions of the edge of the next clamp,

in operation, any two nails, as 5, 5, con-- ottsrpia till fine theparticular downwardly bowed or curved section 4, of the strip betweenthem and drive or thrust it down upon the roofing beneath with apowerful clamping action,

pressure is applied being all in the substantially medial line of theclamp, there is no chance'for the intervening downwardly bowed portionsof the strip forming the clamp to twist or turn or spring to one sideand thereby avoid wholly or in part the transmission of the nailingpressure. On the contrary they are rigidly held in the line of saidnailing pressure and by it are positively driven or clamped down on tothe roofing.

In the modification shown in Fig. 4, the greater width of metal at thedownwardly curved parts 1-2, 12, gives greater stiffness and allowsstill less opportunity for the strip to buckle up when compressed by thenail thrust.

If by any chance, one of the nails, while being driven down,bendssidewise under the reaction of the curved portion of the strip, thenbeing placed under compression, so that said curved portion has a chanceto straighten out completely instead of having its curvature onlypartially reduced by the nailing pressure, the spring action of thedistorted strip still affords strong pressure upon the roofing beneath.As a result, the roofing fabric is firmly compressed at all points bydirect pressure under the nailing domes and by transmitted pressureunder the intermediate sections of the clamp. There are, however, nocutting edges forced into the roofing fabric, no continuous ridge orclamp arch is formed to hold back flowing water, and there are nohighprojections to be struck by a shovel, when cleanin snow off theroof.

T-Iaving thus described my invention, I claim:

l. A clamp for fastening prepared roofing and the like, consisting of aflat strip of metal having a series of properly spaced, perforatednailing domes centered along the substantially medial line of the clamp,the sections between the domes being curved or bowed downwardthroughout.

2. A clamp for fastening prepared roofing and the like, consisting of astrip of metal having a series of properly spaced, perforated nailingdomes, centered along the substantially medial line of the clamp. thesections between the domes being curved or bowed downward throughout,but of rectilinear cross section.

3. A clamp for fastening prepared roofing and the like, consisting ofaflat strip of metal having a series of properly spaced,

perforated nailing domes, centered along the substantially medial lineof the clamp, the sections between the domes being curved or boweddownward throughout and having greater width at their mid portions thanat their junctures with the dome portions of the clamp.

A clamp for fastening prepared roofing and the like, consisting of aflat strip of metalhaving a series of properly spaced, perforatednailing domes centered along the substantially medial line of the clamp,the sections between the domes being curved or bowed downwardthroughout, and having greater width at their mid portions than at theirjunctures with the dome portions of the clamp, the side edges of theclamp forming wave lines each symmetrical with respect to anaxisparallel to the major axis of the clamp.

HENRY R. VVARDELL.

A. J. ARIEL.

